Understanding How Femtosecond Laser Waveguide Fabrication in Glasses Works Page: 5 of 131
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also observed an increase in the intensity of the 605 cm-1 Raman peak relative to the total
Raman intensity, corresponding to an increase in the concentration of 3-membered rings
for all writing conditions. The magnitude of this increase in waveguides fabricated with
a 1 MHz laser was nearly twice that of waveguides fabricated with a 1 kHz laser.
Additional waveguides were fabricated in soda lime silicate glasses to assess the effects
of changing the glass composition. These waveguides formed around, not inside the
exposed regions. This is distinctly different from fused silica in which the waveguides
are inside the exposed regions.
A comprehensive analysis of all the experimental results indicates that good waveguides
are formed below the actual damage threshold of the glass. The rapid quenching model,
which correlates the refractive index of the modified material to its cooling rate, explains
the effect of composition on waveguide behavior.
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Reichman, W J. Understanding How Femtosecond Laser Waveguide Fabrication in Glasses Works, thesis or dissertation, May 11, 2006; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc891320/m1/5/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.